Methane and propane are alkanes.
甲烷和丙烷是烷烃。
As the waste materials decompose, they produce methane gas.
废物腐烂时会产生沼气。
Another gas associated with the spread of agriculture is methane.
另一种与农业扩张有关的气体是甲烷。
Early farmers started clearing forests and livestock produced a lot of extra methane.
早期的农民开始砍伐森林，牲畜产生了大量额外的甲烷。
The burning of methane generates carbon dioxide that is released into the atmosphere.
燃烧甲烷产生二氧化碳，然后释放到大气中。
Other ancient bacteria consumed methane, greatly reducing its amount in the atmosphere.
其他古代细菌消耗甲烷，大大减少了甲烷在大气中的含量。
Animals produce methane, which is another dangerous greenhouse gas when they burp and fart.
动物打嗝、放屁时会产生另一种危险的温室气体甲烷。
The large amount of methane contained in the atmosphere surrounding Neptune stained it blue.
围绕海王星的气层内所含大量甲烷将它染成了蓝色。
It is estimated that 25% of all methane that released into the atmosphere came from farm animals.
据估计，释放到大气中的甲烷有25%来自农场动物。
Therefore, the methane now emitted from open landfills should instead be burned to produce electricity.
因此，现在从露天垃圾填埋场排放的甲烷应该被用来发电。
Many environmental experts now believe that methane is more responsible for global warming than carbon dioxide.
许多环境专家现在认为，甲烷比二氧化碳对全球变暖负有更大的责任。
Other data from the Vostok core show that methane gas also correlates closely with temperature and carbon dioxide.
来自Vostok 地核的其他数据显示，甲烷气体也与温度和二氧化碳密切相关。
The Jovian planets have very thick atmospheres consisting of varying amounts of hydrogen, helium, methane, and ammonia.
木星的行星有非常厚的大气层，且由不同数量的氢、氦、甲烷和氨等元素组成。
The latest research will help astronomers distinguish between the two sources of methane in their search for extraterrestrial life.
这项最新发现将帮助天文学家在寻找外星生命过程中辨别两种来源不同的甲烷。
Insects produce less ammonia than pig and poultry farming, ten times less methane than livestock, and 300 times less nitrous oxide.
昆虫产生的氨比猪和家禽少，它们产生的甲烷比家畜少十倍，而产生的一氧化二氮比家畜少三百倍。
Although the system would consume energy, it would return energy to the grid via methane generation from composting nonedible parts of plants.
尽管该系统会消耗能源，但它会通过从植物不可食用的部分堆肥产生的沼气将能源回馈给电网。
The methane concentration nearly doubled, for example, between the peak of the penultimate glacial period and the following interglacial period.
例如，在倒数第二个冰期的高峰和接下来的间冰期之间，甲烷浓度几乎增加了一倍。
Therefore some scientists postulate that the Earth's earliest atmosphere, unlike that of today, was dominated by hydrogen, methane, and ammonia.
因此，一些科学家推断，地球早期的大气与现在的不一样，主要由氢、甲烷和氨构成。
Many scientists now attribute much of the warming of early Earth to oxygen-intolerant microbes—methanogens—that produce the greenhouse gas methane.
现在，许多科学家把早期造成地球变暖的大部分原因归结于厌氧微生物——产甲烷菌——它产生了温室气体甲烷。
For a start, all animals, such as cows, pigs and sheep, always gas limed methane, which is the second most common green house gas after carbon dioxide.
首先，所有的动物，如牛、猪和羊，总是排出石灰甲烷气体，这是继二氧化碳之后第二常见的温室气体。
In Earth's earliest atmosphere, methane and carbon dioxide occurred at much higher levels than at present-a circumstance that was favorable for early life.
在地球最早的大气层中，甲烷和二氧化碳的含量比现在要高得多，这对早期生命来说是有利的。
Its peak, that is, there is the most carbon dioxide and methane gas, greenhouse gases in the atmosphere just after the beginning of the interglacial period.
它的峰值，就是在间冰期刚开始，大气中有最多的二氧化碳和甲烷气体，温室气体。
Also, things like the damming of rivers has caused increased sediment production, not to mention the addition of more carbon dioxide and methane in the atmosphere.
此外，河流筑坝等工程也增加了沉积物的产量，更不用说大气中二氧化碳和甲烷的增加。
Now, the typical pattern for an interglacial period—and we've studied several—is that the concentration of carbon dioxide and methane gas actually reaches its peak.
现在，我们已经研究过几个间冰期的典型模式，其中一种是大气中二氧化碳和甲烷含量达到峰值的情况。
When our Sun later became hotter, the continued removal of atmospheric carbon dioxide and methane by early bacteria kept Earth's climate from becoming too hot to sustain life.
当我们的太阳后来温度变得更高时，早期细菌持续清除大气中的二氧化碳和甲烷，使地球的气候不至于变得太热而无法维持生命的存在。
Far from the sun, in the outer solar system, beyond Jupiter's orbit, temperatures are low enough to permit ices to form out of water and out of gases like methane and carbon dioxide.
在远离太阳的外太阳系，在木星轨道之外，温度低到足以使冰从水以及甲烷和二氧化碳等气体中形成。
If atmospheric methane and carbon dioxide were as abundant now as they were in Earth's earliest atmosphere, the planet's temperature would likely be too hot for most species living today.
如果大气中的甲烷和二氧化碳像地球最早期的大气那样丰富，那么地球的温度对今天生活的大多数物种来说可能太热了。
Methane gas does collect in the mines around here.
沼气确实积聚在这周围的矿井中。
Paper in landfills causes the release of methane, a gas that is an important factor in climate change all around the world.
垃圾填埋场的废纸会释放甲烷，甲烷是导致全球气候变化的一个重要因素。
The main point stressed is the ability of the anaerobics system to generate methane.
重点强调是否生成甲烷的厌氧系统的能力。
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